Insurance Liabilities - Income statement information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 6,169	$ 3,998
Interest accretion	1,619	1,485
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	886	951
Interest accretion	97	96
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	338	345
Interest accretion	5	4
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	164	160
Interest accretion	38	31
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	16	16
Interest accretion	8	7
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,781	1,751
Interest accretion	354	360
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	855	922
Interest accretion	95	94
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	3,709	1,558
Interest accretion	478	333
Other Operations before consolidation and eliminations | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	31	29
Interest accretion	2	2
Legacy Insurance Lines Segment
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	161	168
Interest accretion	$ 736	$ 750